Two years later, snakeheads spread to the Potomac River and now, Missouri is one of the latest states to warn about the invasive fish species. The northern snakehead is an invasive fish species ...

The invasive northern snakehead ... States in a Maryland pond in 2002, the U.S. Fish and Wildlife Service said. From there to the Potomac River, rivers in Pennsylvania and onward.

Snakeheads made their way to the Potomac River two years later, and Missouri is now among the most recent states to issue a warning about the invasive fish species. Its head has a snake-like ...